New Zealand Journal of Marine and Freshwater Research abstracts
Summer light-trap catches of adult Trichoptera in hill-country
catchments of contrasting land use, Waikato, New Zealand
KEVIN J. COLLIER
BRIAN J. SMITH
BRENDA R. BAILLIE*
National Institute of Water & Atmospheric
Research Ltd
P. O. Box 11 115
Hamilton, New Zealand
*Present address: Liro Ltd, P. O. Box 2244, Rotorua, New Zealand.
Abstract The distribution of adult Trichoptera in light traps
was investigated alongside nine streams draining catchments under native
forest, pine forest, or pasture near Hamilton, Waikato, New Zealand. The aim of
the study was to determine the relationship between abundance, taxonomic
richness, and community composition with respect to land use during summer, and
to evaluate the use of adult Trichoptera compared with benthic invertebrates as
potential bio-indicators of the effectiveness of land-management changes. Adult
Trichoptera faunas alongside the native streams were dominated by
Hydrobiosidae, Conoesucidae, and Helicopsychidae (each >10% of total
Trichoptera numbers for at least two of the three sites), whereas Leptoceridae,
Oeconescidae, and Hydrobiosidae were relatively abundant alongside at least two
of the pine sites. Adult Trichoptera faunas at the pasture sites were strongly
dominated by Hydroptilidae which made up 47-85% of numbers caught at all sites.
The mean number of individuals and taxa caught in light traps increased from
November to January and then declined in February for all land-use types.
Overall, total numbers and taxonomic richness of adult Trichoptera were
significantly lower at the pine sites compared to the pasture or native sites.
TWINSPAN classification of benthic invertebrates collected in November clearly
differentiated sites based on land use for presence/absence and percentage
abundance data. A similar pattern was evident for most sites when adult
Trichoptera faunas were used for the four sampling dates combined, suggesting
that light trapping has potential as a tool for bio-monitoring.
Keywords Trichoptera; adult aquatic insects; light trap; land
use; bio-monitoring; Waikato
New Zealand Journal of Marine and Freshwater Research, 1997, Vol. 31:
623-634
0028-8330/97/3105-0623 $7.00/0 (c) The Royal Society of New Zealand
1997
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